The MoGo mouse which I mentioned awhile back is now shipping. I probably won't pick one up because the Toshiba trackpad is fine, but I'm still tempted. The only other issue is that I generally have my EVDO card in my laptop when it is powered up, so charging could be somewhat of an issue.
It could be especially useful if we ever get that X60 with its little nub instead of a trackpad though.